Custom-made wheel on aluminum edge with steel hub and also spokes. 12 x 1.75 pneumatically-driven tires. If the biker is a little older and also stronger and also can handle the included weight of the pneumatic system (and you're willing to maintain proper tire inflation!) this wheel set offers an excellent trip characteristic and also outstanding traction. For beginning riders or actually young/lightweight bikers, we still suggest the typical EVA polymer wheel set as a result of its lightweight. Each pneumatically-driven wheel evaluates regarding 1 POUND greater than the EVA polymer wheel set. Tires are sold as a set.